A new redox molecule-based half-adder with tetrathiafulvalene (TTF) was reported for the first time. This half-adder employs electrochemical and chemical oxidations (NOPF6) as input signals and absorbances at 350 and 435 nm as output signals. It is interesting to note that this new molecule-based half-adder shows reset capability by making use of the unique redox behaviors of TTF.